Single-Cation Two-dimensional Formamidium Lead Halide Perovskite Films: Fabrication and Study of Optical Properties
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Metal halide perovskites are an emerging class of low-cost and solution-processable semiconducting materials potential for various optoelectronic applications. Recently, two-dimensional (2D) metal halide perovskites have received tremendous attractive research interest owing to their bright fluorescent at solid state, strong exciton binding energy, and showing higher stability against moisture compare to 3D counterparts. In this work, we provided a simple in situ fabrication technique to prepare the quantum confined single-cation 2D FAn+1PbnBr3n+1 films. The prepared single-cation FAn+1PbnBr3n+1 films showed an interesting phase transition to 3D FAPbBr3 under intense humidity or light exposure. The solvent- and photo-induce phase transition can be utilized for security inks and anti-counterfeiting applications.